Indirect study of 19Ne states near the 18F+p threshold

N. de Sereville, A. Coc, C. Angulo, M. Assuncao, D. Beaumel, E. berthoumieux, B. Bouzid, S. Cherubini, M. Couder, P. Demaret, F de Oliveira Santos, P. Figuera, S. Fortier, M. Gaelens, F. Hammache, J. Kiener, A. Lefebvre-Schuhl, D. Labar, P. Leleux, M. Loiselet, A. Ninane, S. Ouichaoui, G. Ryckewaert, N. Smirnova, V. Tatischeff

Submitted on 16 February 2007


The early E < 511 keV gamma-ray emission from novae depends critically on the 18F(p,a)15O reaction. Unfortunately the reaction rate of the 18F(p,a)15O reaction is still largely uncertain due to the unknown strengths of low-lying proton resonances near the 18F+p threshold which play an important role in the nova temperature regime. We report here our last results concerning the study of the d(18F,p)19F(alpha)15N transfer reaction. We show in particular that these two low-lying resonances cannot be neglected. These results are then used to perform a careful study of the remaining uncertainties associated to the 18F(p,a)15O and 18F(p,g)19Ne reaction rates.


Comment: 18 pages, 8 figures. Accepted in Nuclear Physics A

Subjects: Nuclear Experiment; Astrophysics